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• Live streaming doesn't work

  18 octobre 2017, par John Smith

  I’m using FFmpeg to capture my screen :

  ffmpeg -f dshow -i video="UScreenCapture" -r 5 -s 640x480 -acodec libmp3lame -ac 1 -vcodec mpeg 4 -vtag divx -q 10 -f mpegts tcp://127.0.0.1:1234

  so let it stream to somewhere. The accepter script :

   error_reporting(E_ALL); /* Allow the script to hang around waiting for connections. */
  
   set_time_limit(30); /* Turn on implicit output flushing so we see what we're getting as it comes in. */
  
   ob_implicit_flush();
  
  
  
  
  
  $address = '127.0.0.1';
  
  $port = 1234;
  
  $outfile = dirname(__FILE__)."/output.flv";
  
  $ofp = fopen($outfile, 'wb');
  
  
  
   if (($sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP)) === false) { echo "socket_create() failed: reason: " . socket_strerror(socket_last_error()) . "\n"; sleep (5); die; }
  
   if (socket_bind($sock, $address, $port) === false) { echo "socket_bind() failed: reason: " . socket_strerror(socket_last_error($sock)) . "\n"; sleep (5); die; }
  
   if (socket_listen($sock, 5) === false) { echo "socket_listen() failed: reason: " . socket_strerror(socket_last_error($sock)) . "\n"; sleep (5); die; }
  
   if (($msgsock = socket_accept($sock)) === false) { echo "socket_accept() failed: reason: " . socket_strerror(socket_last_error($sock)) . "\n"; sleep (5); break; }
  
   do {
  
      $a = '';
  
      socket_recv ($msgsock, $a, 65536, MSG_WAITALL);
  
      fwrite ($ofp, $a);
  
      //echo strlen($a)."\r\n";
  
   } while (true);

  it seems to save the stuff to the disk OK. Now here comes the html :

  I dont really know how to do this, but based on an example :

  <video src="/output.flv"></video>

  but it doesn’t do anything. And if I want to stream the live incoming stuff, then what’s the matter ?

• Rotate 90 and concatenate videos with ffmpeg

  20 avril 2024, par leonp

  I have several videos made in landscape and portrait modes. I want to concatenate them into one movie.

  


  For this I rotated portrait videos with :

  


  ffmpeg -i in.mp4 -vf transpose=1 out.mp4    


  


  Built the list of files to concatenate and concatenated all of them with :

  


  ffmpeg -safe 0 -f concat -i list.txt -c copy output.mp4    


  


  The result is unplayable. All players hang/crash at the first switch from landscape to rotated portrait fragment.

  


  What do I do wrong ?

  


  In reply to LordNeckbeard request :

  


  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '1.mp4':
Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    creation_time   : 2017-07-20T12:50:32.000000Z
  Duration: 00:00:30.36, start: 0.000000, bitrate: 20202 kb/s
    Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080, 20005 kb/s, SAR 1:1 DAR 16:9, 29.45 fps, 29.42 tbr, 90k tbn, 180k tbc (default)
    Metadata:
      creation_time   : 2017-07-20T12:50:32.000000Z
      handler_name    : VideoHandle
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 156 kb/s (default)
    Metadata:
      creation_time   : 2017-07-20T12:50:32.000000Z
      handler_name    : SoundHandle

Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '2.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    creation_time   : 2017-07-24T13:57:42.000000Z
  Duration: 00:00:31.94, start: 0.000000, bitrate: 20171 kb/s
    Stream #1:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080, 19997 kb/s, SAR 1:1 DAR 16:9, 29.43 fps, 29.42 tbr, 90k tbn, 180k tbc (default)
    Metadata:
      rotate          : 90
      creation_time   : 2017-07-24T13:57:42.000000Z
      handler_name    : VideoHandle
    Side data:
      displaymatrix: rotation of -90.00 degrees
    Stream #1:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 156 kb/s (default)
    Metadata:
      creation_time   : 2017-07-24T13:57:42.000000Z
      handler_name    : SoundHandle

At least one output file must be specified```


  


• FFmpeg hangs on buffer fill c++

  2 mars 2021, par Derek Halden

  I'm processing a bunch of frames from an RTSP stream using ffmpeg. I end up doing a lot of processing on these frames, which means that I'm not always pulling in real-time. If the buffer gets full, the process hangs. I'm wondering if one of the following solutions is feasible/fixes the problem, and if so, how I would implement it using the ffmpeg libraries :

  



  1) Is there a way to clear the buffer if I ever reach a point where it's hanging ? (I can determine when it's hung, I just don't know what to do about it).

  



  2) Is there a way to make the buffer overwrite the old data, and just always read the most recent data ? It doesn't matter to me if I lose frames.

  



  3) I've already discovered that I can make the buffer arbtrarily large with : av_dict_set(&avd, "buffer_size", "655360", 0);. This could be a solution, but I don't know how large/small it needs to be, because I don't know how long the stream will post video for ?

  



  4) Is this just a bug that I need to bring up with the ffmpeg people ?

  



  5) Something else I haven't considered ?

  



  while(av_read_frame(context, &(packet)) >= 0 && fcount < fps*SECONDS) {
    clock_t start, end;
    int ret = avcodec_send_packet(codec_context, packet);
    if(!(packet->stream_index == video_stream_index)) {
      continue;
    }

    if (ret == AVERROR(EAGAIN) || ret == AVERROR(EINVAL)) {
      continue;
    } else if (ret < 0) {
      cerr << "Error while decoding frame " << fcount << endl;
      exit(1);
    }

    ret = avcodec_receive_frame(codec_context, frame);
    if (ret == AVERROR(EAGAIN) || ret == AVERROR(EINVAL)) {
      continue;
    } else if (ret < 0) {
      cerr << "Error while decoding frame " << fcount << endl;
      exit(1);
    }

    sws_scale(img_convert_ctx, frame->data, frame->linesize, 0,
              codec_context->height, picture_rgb->data, picture_rgb->linesize);

    if(!frame) {
      cerr << "Could not allocate video frame" << endl;
      exit(1);
    }

    if(codec_context == NULL) {
      cerr << "Cannot initialize the conversion context!" << endl;
      exit(1);
    }

    // Do something with the frame here

    fcount++;
    av_packet_unref(&(packet));

}


  



  I have added the code that causes the program to hang.